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Full Discussion: Perform an action if certain text exist in output (PERL)
Top Forums Shell Programming and Scripting Perform an action if certain text exist in output (PERL) Post 302777349 by Corona688 on Thursday 7th of March 2013 05:19:06 PM
Old 03-07-2013
When most of your "perl" is shell statements in backticks, you're fighting the language. Each individual set of backticks is its own independent shell anyway, you might as well use one shell instead of thirty.

Code:
#!/bin/sh

while read LINE
do
        # This works for Linux ping.
        # Solaris ping just prints 'x is alive' all by itself
        # others may vary.
        if ping -c 1 $LINE
        then
                echo "$LINE is alive"
        else
                echo "Couldn't ping $LINE"
        fi
done

I feel your pain, I learned Perl first too, but trying to use it as a shell just makes ugly code -- you'll spend most of your time, effort, and code getting things in and out of shell.

Strip out the perl, keep the shell, and you can do the same job faster in half the code.

You might find it better to process ping's output than nslookup's output, they both look up domain names.
Last edited by Corona688; 03-07-2013 at 06:25 PM..
 

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LEARN ABOUT MOJAVE

platform::shell

platform::shell(n)					       Tcl Bundled Packages						platform::shell(n)

__________________________________________________________________________________________________________________________________________________

NAME

       platform::shell - System identification support code and utilities

SYNOPSIS

       package require platform::shell ?1.1.4?

       platform::shell::generic shell
       platform::shell::identify shell
       platform::shell::platform shell
_________________________________________________________________

DESCRIPTION

       The platform::shell package provides several utility commands useful for the identification of the architecture of a specific Tcl shell.

       This  package  allows the identification of the architecture of a specific Tcl shell different from the shell running the package. The only
       requirement is that the other shell (identified by its path), is actually executable on the current machine.

       While for most platform this means that the architecture of the interrogated shell is identical to the architecture of  the  running  shell
       this  is  not generally true. A counter example are all platforms which have 32 and 64 bit variants and where a 64bit system is able to run
       32bit code. For these running and interrogated shell may have different 32/64 bit settings and thus different identifiers.

       For applications like a code repository it is important to identify the architecture of the shell which will  actually  run  the  installed
       packages, versus the architecture of the shell running the repository software.

COMMANDS

       platform::shell::identify shell
	      This command does the same identification as platform::identify, for the specified Tcl shell, in contrast to the running shell.

       platform::shell::generic shell
	      This command does the same identification as platform::generic, for the specified Tcl shell, in contrast to the running shell.

       platform::shell::platform shell
	      This command returns the contents of tcl_platform(platform) for the specified Tcl shell.

KEYWORDS

       operating system, cpu architecture, platform, architecture

platform::shell 						       1.1.4							platform::shell(n)
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